230 
Transactions Texas Academy of Science. 
365. :S'TREERUwiTz^ W. H. Von. 
Eeport of G-eologisit for Western Texas. 
Texas Geol. and Min. Siirv., First Eept. of Prog., 1888, pp. 
31-43. Austin, 1889. 
This report, which is in the form of a diary, is the record of many val- 
uable observations upon topography, economic geology, climate, hydrogra- 
phy, etc., but so numerous and disconnected that a summary is well nigh 
impossible. The party left , El Paso October 11, 1888, and its explorations 
covered the remainder of that month and the whole of the following. 
“As may be seen from this report, I followed the granitic, porphyritic, 
and crystalline schistose portions of the mountain ranges from Pio Grande, 
through the Franklin range, through the Quitman, -Sierra Blanca, Sierra 
iCarriza, Eagle Spring, Van Horn and Chispa mountains to the Apache 
range, and through part of this, touching the Sierra Diabolo and some 
less important ranges. I selected such slopes as had mines or prospects 
partly developed, and where I could hope to find information and water.” 
P. 43. 
Compiled Tables of Eainfall. 
Eainfall from 1879 to 1887, at Fort Davis and Surrounding 
Circle of Country of 100 miles Diameter. 
Average Annual Eainfall by Months. 
Vormal Average Temperature in West Texas. 
Texas Geol. and Min. Surv., First Eept. of Prog., 1888. 
,p, 44. Austin, 1889. 
Compiled from the Records of the U. S. Signal Office. 
367. 
Eeport of. 
First Ann. Eept. Geol. Surv. of Texas, 1889, pp. Ixxix-lxxxi. 
Austin, 1890. 
Administrative Report. “The portion of the State to which my field 
work was confined during the year 1889 is that extreme western part, 
embraced between the Pecos river and Rio Grande, known as Trans-Pecos 
, Texas, and the time I was in the field was devoted principally to prepara- 
tory work and determinations which were positively essential to a cor- 
rect understanding of its geology. For successful geological determina- 
tions and investigations of this part of the country, the study of the topog- 
raphy is absolutely required. Eruptive rock, of different periods and char- 
..,acter, intrude into and penetrate the sedimentary strata, which are also 
of different ages, and for the most part strongly metamorphosed. 
“The mountain groups and ranges and the hills are separated from each 
other by wide gaps and extensive flats, filled in with more recent deposits, 
which add greatly to the complications of the geological work in this part 
of the State, 
